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I used the exact same pressure cooker for years, and it never let me down. 10 P.S.I is fine, even for grains. Just make sure to add an inch or two of water, and cook for 1 hr 15 mins when doing grains. The rocker setup releases more water than higher quality cookers, so as long as you have enough water you'll be fine.

10 P.S.I. is all you need for this hobby, it's just that 15 PSI is more convenient and cuts down on sterilization times.

--------------------To find a place to live between the negatives and positives.

The mirro 8 qt and larger has a selectable pressure setup and will do 5, 10, 15. All the current Presto's are set to 15. (very new ones will be 7,12, and ~15) The stainless units are more money but do not add metal to the mix where aluminum pots put a little metal in whatever you have in there. Add a little (cap full) of vineger to your water to keep the hard water powder off your bottles. Presto has a nicer handle mounting and is less likly to cause problems. Mirro is cheaper, but hard to find not damaged in shipping. All American just plain ROCKS.